Sam4s ER-260 SERIES Service Manual page 37

5-7 Serial I/F Problem
RS-232C Problem
Loop Back
Communication
H/W Handshake
SAM4S ER-260 SERIES
Y
Failure?
N
Y
Failure?
N
N
Ok?
Y
End
1. Perform the "SELF TEST" in the S-MODE using the Loop
Back test Connector.
2. Check the connection of the RS-232C Connector and Loop
Back Connector.
3. Check the TXD,RXD, DTR, DSR Pin on CPU.
4. Check the MAX232 Driving Chip and related Circuit on
Serial I/F B'D.
1. Check the connection of the RS-232C and Other side.
2. Check the I/F Cable whether it is open or short.
3. Check whether Signal is affected by the Cable Noise.
1. Check the connection of the H/W handshaking Line and Other
side
2. Check the I/F Cable whether it is open or short.
3. Confirm the H/W handshaking Protocol.
5. Troubleshooting
5-7